| Acronym | Definition |
|---|
| ORB | Object Request Broker (CORBA) |
| ORB | Old Orchard Beach (Amtrak station code; Old Orchard Beach, ME) |
| ORB | Oak Ridge Boys (band) |
| ORB | Online Reference Book |
| ORB | Object Request Broker |
| ORB | Offworld Resource Base |
| ORB | O-Ring Boss (hydraulic seal) |
| ORB | Officer Record Brief |
| ORB | Ostdeutscher Rundfunk Brandenburg (German Radio and TV Station) |
| ORB | Organic Radical Battery |
| ORB | Off-world Resource Base (game by Strategy First games) |
| ORB | Observatoire Royal de Belgique (Royal Observatory of Belgium) |
| ORB | Oil Rub Bronze |
| ORB | Operation Request Block |
| ORB | Order Ready Board (various companies) |
| ORB | Origins of Behavior (Cornell College; Iowa) |
| ORB | Orebro, Sweden - Orebro (Airport Code) |
| ORB | Object Ring Buffer (earthquake software device) |
| ORB | Operational Review Board |
| ORB | Optimization Research Bridge |
| ORB | Outside Reading Book |
| ORB | Ornate Rune Blade (Everquest game weapon) |
| ORB | Organizational Retaliatory Behavior |
| ORB | Ocean Resources Branch (Hawaii) |
| ORB | Orange Belt Stages (Visalia, CA) |
| ORB | Ocean Rate Bulletin (transport industry publication) |